Trimethyl phosphite is widely used as a key intermediate in the synthesis of organophosphorus compounds, particularly in the production of pesticides, fungicides, and flame retardants. It acts as a reducing agent in organic reactions, facilitating the conversion of various functional groups. In the polymer industry, it serves as a stabilizer and antioxidant, enhancing the durability and performance of plastics against heat and light. Additionally, it is utilized in the preparation of pharmaceuticals, where it plays a role in the synthesis of active ingredients. Its application also extends to the production of lubricant additives, improving the efficiency and lifespan of machinery. Furthermore, it finds use in the electronics industry for synthesizing phosphorus-based compounds in protective coatings and flame-retardant materials.